package com.wmm.filter;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.io.IOException;

public class LoginFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest httpServletRequest =  (HttpServletRequest) servletRequest;
        HttpSession session = httpServletRequest.getSession();
        Object userName = session.getAttribute("user");
        String servletPath = httpServletRequest.getServletPath();
        if (null == userName && !servletPath.contains("login")){
            servletRequest.getRequestDispatcher("login.jsp").forward(servletRequest, servletResponse);
        }else {
            filterChain.doFilter(servletRequest, servletResponse);
        }
    }

    @Override
    public void destroy() {

    }
}
